Weiler 21096 Maintenance Tube Brush, Industrial Grade Performance Line, 1/2 in Brush Dia, 2 in Brush Length, 8 in Overall Length, Steel Fill, 0.004 in Filament/wire Diameter, 1/8 in Stem Dia, Single Spiral, Single Stem and Loop. Tube brush for internal cleaning, deburring, and surface preparation of holes, tubes, and pipes. Manufacturer part number: 21096.